Amplitude spectrum compensation and phase spectrum correction of seismic data based on the generalized S transform
Zhou Huai-Lai1,2,3, Wang Jun4, Wang Ming-Chun5, Shen Ming-Cheng3, Zhang Xin-Kun3, and Liang Ping6
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, CDUT, Chengdu 610059, China.
2. Key Lab of Earth Exploration & Information Techniques of Ministry of Education, CDUT, Chengdu 610059, China.
3. College of Geophysics, Chengdu University of Technology, Chengdu 610059, China.
4. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China.
5. Exploration and Development Institute of Bohai Oil Field of CNOOC Co., Ltd Tianjin Branch, Tianjing 300452, China.
6. College of Energy Resource, Chengdu University of Technology, Chengdu 610059, China.
Abstract:
We propose a method for the compensation and phase correction of the amplitude spectrum based on the generalized S transform. The compensation of the amplitude spectrum within a reliable frequency range of the seismic record is performed in the S domain to restore the amplitude spectrum of reflection. We use spectral simulation methods to fit the time-dependent amplitude spectrum and compensate for the amplitude attenuation owing to absorption. We use phase scanning to select the time-, space-, and frequency-dependent phases correction based on the parsimony criterion and eliminate the residual phase effect of the wavelet in the S domain. The method does not directly calculate the Q value; thus, it can be applied to the case of variable Q. The comparison of the theory model and field data verify that the proposed method can recover the amplitude spectrum of the strata reflectivity, while eliminating the effect of the residual phase of the wavelet. Thus, the wavelet approaches the zero-phase wavelet and, the seismic resolution is improved.
ZHOU Huai-Lai,WANG Jun,WANG Ming-Chun et al. Amplitude spectrum compensation and phase spectrum correction of seismic data based on the generalized S transform[J]. APPLIED GEOPHYSICS, 2014, 11(4): 468-478.
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